* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 
    'Microsoft YaHei', '微软雅黑', Arial, sans-serif;
  background-color: #f5f5f5;
}

#app {
  height: 100vh;
  overflow: hidden;
}